Improvement in dovetailing-mach ines



"UNITED kSTATES PATENT OFFICE,

JUAN S. L. BABBS, OF NEW ALBANY, INDIANA.

IMPROVEMENT lIN DOVETAILlN'G-MACHINES.

Specification forming part of Letters Patent N o. 55,223, dated June 5, 1866.

To all whom it may concer-n:

Be it known that I, JUAN S. L. BABES, of New Albany, in the county of Floyd, in the State of Indiana, have invented an Improvement in Dovetailing-Maehines, and I do hereby declare that the following, taken in connection with the drawings which acccoin pany and form part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

This invention is an improvement designed to be incorporated into the dovetailing-1nachine patented under the number 41,992 to S. E. Hartwell on the 22d day of March, 1864.

In the fronts and backs of drawers or other pieces corresponding thereunto the cutters of said Hartwells machine leave a semicircular termination of the mort-ises, while the tenons cut by Hartwells machine, organized as described in his said patent, are not rounded to t or to approximate to lit the circular termination of the mortises.

To round the tenons so that they will tit or approximate to the semicircular termination ofthe mortises is the object of my invention, which consists in the combination, with the conical cutters and the slide by which the stock is presented to the action of the cutters, of a secondary carriage or stock-holder, when arranged to convey the stock with the tenons formed thereupon partially around thecutter, by which means the angles are removed from the part of the tenons coming innermost in drawer, box, or similar work, the tenons being thus rounded to it or approximate to a tit so that the tenons may be pressed fully into the is a sectional plan of the tenons, the section being taken in the line of their junction with the piece from which they are formed, this view showing the condition of the tenons as left by the Hartwell machine before referred to. Fig. 4 is a view similar to Fig. 3, but shows the tenons as changed in form by the operation of my addition to Hartwells machine.

As in Hartwells patent, C O represent the cutter-heads, E the carriage by and on which the stock is carried to the action of the cutters, and F F are the ways on which the carriage E moves. Properly located with respect to the cutters is a clamp-box, a, provided with means for holding pieces on the ends of which the pins or tenons are to be cut, such means being represented by the screw l). This box is mounted at each end by ears'c on the crankpins d ixed in the pieces c, which are journaled to the carriage or slide E, the pieces c being connected so as to more together by their arms e e and the link f.

Operation: The stock for the drawer ends or other similar pieces being in readiness, the carriage E, with the clamp-box thereon, is rcmoved from vicinity ot' the cutters, or so that in the apparatus shown in the drawings the edge 1 of the carriage is brought near the edge 2 ot' its support. The osition of a, and the parts therewith connected, with reference to carriage E, being made that seen in Fig. 1, the stock requiring the forma-tion of tenons thereon is clamped inbox a by screw b, and then the carriage E and box a are moved in the direction ofthe arrow, Fig. 1, till the cutters form the dovetail grooves through the stock, this leaving the tenons required and the parts in the position shown in said ligure. The cutters having now formed clear paths through the stock, the clamp-box is moved by the operator from position seen in Fig. 1 to that shown in Fig. 2, the lever g being employed by the operator to move the parts.

I claim- The combination, with the conical cutters and the carriage by which the stock is presented to the action of the cutters, of a secondary carriage or stock-holder, arranged to operate substantiallly as set forth.

JUAN S. L. BABBS.

Witnesses: v

Tnonns G. MORRISON, GHAs. H. KELLY. 

